Design Guide

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
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• Set EDCA Profile to Voice Optimized or Voice and Video Optimized
• Set Enable Low Latency MAC to Disabled
• Ensure that Power Constraint is Disabled
• Enable Channel Announcement and Channel Quiet Mode
• Configure the High Throughput Data Rates as necessary
• Configure the Frame Aggregation settings
• Enable CleanAir if utilizing Cisco Access Points with CleanAir technology
• Configure Multicast Direct Feature as necessary
• Set the 802.1p tag to 5 for the Platinum QoS profile
802.11 Network Settings
It is recommended to have the Cisco Wireless IP Phone 8821 and 8821-EX operate on the 5 GHz band only due to have many
channels available and not as many interferers as the 2.4 GHz band has.
If wanting to use 5 GHz, ensure the 802.11a/n/ac network status is Enabled.
Set the Beacon Period to 100 ms.
Ensure DTPC Support is enabled.
If using Cisco 802.11n capable Access Points, ensure ClientLink is enabled.
With the current releases, Maximum Allowed Clients can be configured.
Recommended to set 12 Mbps as the mandatory (basic) rate and 18 Mbps and higher as supported (optional) rates; however
some environments may require 6 Mbps to be enabled as a mandatory (basic) rate.
Enable CCX Location Measurement.
If wanting to use 2.4 GHz, ensure the 802.11b/g/n network status and 802.11g is enabled.
Set the Beacon Period to 100 ms.